<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 200px;
            height: 200px;
            background: red;
        }
        .box2{
            width: 100px;
            height: 100px;
            background: blue;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="box2">

        </div>
    </div>
    <script>
        // 一、阻止事件的冒泡、捕获
        // 1.e.cancelBubble = true;
        // 2.e.stopPropagation();

        // var boxEle = document.querySelector(".box");
        // boxEle.addEventListener("click",function(e){
        //     console.log("点击了红色");

        // })
        // var box2Ele = document.querySelector(".box2");
        // box2Ele.addEventListener("click",function(e){
        //     console.log("点击了蓝色");
        //     // e.cancelBubble = true;
        //     e.stopPropagation();
        // })

        // 二、点击的目标 target
        var box2Ele = document.querySelector(".box2");
        box2Ele.onclick = function(e){
            // console.log(e.target)
            // e.srcElement ：IE8及以下浏览器
            var target = e.target || e.srcElement;
            console.log(target);
        }


    </script>
</body>
</html>